Impregnating and coating composition and method of preparing same



I am familiar.

UNITED STATES PATENT OFFICE..-

EARLE T. OAKES, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, T0

NATIONAL BISCUIT COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEWJERSEY.

IMPREGNATING AND COATING- COMPOSITION AND METHOD OF PREPARING SAME.

No Drawing.

T 0 all whom it may concern.

Be it known that I, EARLE T. Qaxnsmesiding in the borough of Manhattan,city, county, and State of New York, have invented certain new anduseful Improvements in Impregnating and Coating Compositions and Methodsof Preparing Same, of which the following is a specification.

My invention relates to a composition embodying gelatinized tung oilcontained, in subdivided condition, in a suitable liquid carrier wherebythe composition may readily be used for impregnating 'or coating paperand other material. My invention also relate s to processes forproducing such a product.

Tung oil, or China Wood oil, may be converted by suitable heat treatmentinto a rubbery gelatinous condition, which product I refer to asgelatinized tung oil. Thls product is insoluble in all solvents withwhich I have found that when paper or cardboard is impregnated with thisgelatinized tung oil it becomes not only moisture-proof but alsogrease-proof. Paper or cardboard impregnated or coated with the same is,therefore, a highly desirable material for use, for example, as acontainer or wrapping for food products, especially since thegelatinized tung oil may be taken into the human system without harmfuleffect. The gelatinized tung oil has desirable properties in addition tothose mentioned above so that paper or fibrous material impregnated withthe same will have various uses.

The tung oil may be gelatinized by heating the same to a temperature ofapproximately 250 degrees C. for about .nine to twelve. minutes. Theproduct may also be formed by heating the same to approximately onehundred degrees C. for a period of from twelve to fourteen hours.Applica tion of the higher temperature. is, however, preferable, notonly because of the saving in time but also because a more uniformproduct is produced and there is less oxidation, as is apt to be thecase when the lower temperature for the longer time is employed.

If it be attempted to impregnate paper or other fibrous material with agelatinized product, by impregnating the material with raw oil and thenheating the same to gelatinize the oil, the difliculty at once arisesSpecification of letters Patent.

Patented Apr. 4, 1922..

Application filed January 19,1920. Seuial No. 352,543.

'gelatinized product and thereafter driving off the solvent hasapparently been nonexistent.

' In accordance with my invention, I overcome these difficulties byplacing the gelatiniaed product, in a finely subdivided condition, insuspension or colloidal solution in a. suitable liquid carrier. Ihavefound that when certainliquids are added to the gelatnized tung oil theyhave the effect of causing the same to swell or increase in bulk to aconsiderable extent, apparently to four or five times the original bulkof the gelatinized Oll. When the gelatinized oil, mixed with the liquidcarrier and swollen thereby, and ground or otherwise comminuted to astate of fine subdivision, is added toa sufiicient quantity of theliquid carrier it is found that the particles of gelatinized productremain suspended for a considerable time, apparently in a state ofcolloidal solution, in the liquid carrier.

I have found that various solvents such as those which are commonly usedin the making of varnish and the like, are suitable hol,carbon'tetrachloride, ether and acetone.

These liquids are solvents for gums and resins generally and thereforevarious of the well known gums and resins may be added to thecomposition, if so desired, to add body and strength to the compositionwhich results after the solvent or liquid carrier has been driven off.

In practicing my improved process and producing the product describedherein, the tung oil is gelatinized by heat treatment as abovedescribed, preferably by an application'ofheat at about 250 degrees C.for a sufficient length of time. The liquid carrier referred to, suchfor example as solvent naphtha. or turpentine, may be poured on thegelatinized oil when the latter has been formed and cooled, or at themoment when the oil begins to gelatinize during its heat treatment. Or,the liquid and the gelatinized oil may be mixed during the grindin orcomminuting of the gelatinize oil. have found that the presence of theliquid carrier and swelling agent, such as solvent naphtha or tu ntinereferred to, results in making the g eldtinized oil very much lesssticky and gummy than it otherwise would be so that it is much easier togrind or cut or otherwise comminute the gelatinized oil when the liquidcarrier is present.

The gelatinized oil may accordingly be passed through grinding rolls orbetween suitable cutters together with a sufficient quantity of the liuid carrier of the character referred to. he bestprocedure is probaby toadda sufiicient amount of the li uid carrier to the gelatinized productbe ore grinding to cause a considerable swelling of the gelatinized bodyand to add more of the liquid carrier to the gelatinized product duringthe grinding of comminuting operation if it is found that the rolls orknives are getting gummed up. After the grinding or comminuting has beenfinished an additional amount of liquid carrier may be added inaccordance with the degree of fluidity which is desired for the product.The solvent or liquid carrier may effectively be used through a widerange of proportions,

' for example, in proportions of from two to ten times the volume of thegelatinized prodnot. The result is a free flowing liquid containing thegelatinized product in colloidal solution or sus nsion.

If added b ies such as the common gums are thought desirable forincorporation in the mass, the same maybe added to the tung oil eitherbefore or after the gelatinizing of the oil, preferably before. Amongthe substances which may effectively be added may be mentioned shellac,resin, sandarac, etc.

If paper or the like is to be coated 01' impregnated with the material,the article may be'dipped or brushed or otherwise treated with the fluidmaterial. Thus paper may be run through a bath of the composition andsubsequently thro'u h squeeze rolls in the usual way. After t e paper orfibrous material has been coated or impregnated the material is dried todrive off the solvent or liquid carrier, the resulting product havingthe desirable properties named.

It will be understood that my invention is not limited strictly to thedetails particularly described, but is as broad as is indidated by theaccompanying claims.

copal, kauri,

What I claim is: 1. A new composition of matter, comprising gelatinizingtung oil in colloidal solution in a suitable liquid carrier adapted tocondition, and a solvent for gums and resins,-

having the property of swelling the gelatinized tung oil onadditionthereto, the gelatinized tung oil being contained in the solvent'inthe condition of colloidal solution or suspension.

4. A new composition of matter, con1-' prising gelatinized tung oil infinely subdivided condition, a solvent for gums and resins, having theproperty of swelling the gelatinizedtung oil on addition thereto, and asubstance of the gum class dissolved in said solvent.

5. Theprocess of preparing a composition, comprising, heatin tung oil togelatinize the same, subdividing the product and adding a liquid,adapted to swell the elatinized product and contain the same in nelysubdivided form, in suspension.

6. The process of preparing a composition, comprising, heating tung oilto gelatinize the'same, subdividing the product and adding a solvent forgums and resins, having the property of swelling the gelatinizedproduct, in sufiicient quantity to form a fluid mass containing theswollen subdivided gelatinized product. i

7. The process of preparing a composition, comprising, heating tung oilto gelatiuize the same, adding a liquid, adapted to swell thegelatinized product and to contain the same, when in subdivided form, insus pension,- and subdividi the gelatinized product in the presence 0said liquid.

This specification signed and witnessed this 15th day of January, 1920.

EARLE. T. OAKES. Witnesses: CLARKE E. DAVIS, D. J. MAVEETI'.

